Can't find libx11 on mono

Hi all. I'm trying to get farseer working with Mono(and OpenTK). I downloaded the Class version and went through the code making a few required changes. Ultimately, it compiled, but it throws a DLLNotFound exception. libx11. I can't tell if this is caused
by farseer or if it just happened to be the catalyst. If anyone has any insight, I'd love to hear it.